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Design of a Flexible Weight Sensor Using Optical Fibre Macrobending.

Adam C Funnell1, Peter James Thomas1

  • 1NORCE Norwegian Research Centre AS, 5008 Bergen, Norway.

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|January 21, 2023
PubMed
Summary
This summary is machine-generated.

This study presents a flexible optical fiber weight sensor that measures weight by detecting changes in light loss due to bending. The sensor shows a linear response for weights over 2 kg and its sensitivity can be adjusted by altering physical parameters.

Keywords:
flexible weight sensoroptical fibre macrobending lossoptical fibre sensor

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Flexible sensors are crucial for various applications, including wearable devices and structural health monitoring.
  • Optical fiber sensors offer advantages such as immunity to electromagnetic interference and remote sensing capabilities.
  • Macrobending loss in optical fibers is a known phenomenon that can be exploited for sensing applications.

Purpose of the Study:

  • To develop and characterize a flexible weight sensor utilizing optical fiber macrobending loss.
  • To investigate the influence of different sensor components and designs on performance.
  • To establish the sensor's response linearity and tunability for weight measurement.

Main Methods:

  • A sensor design employing an impactor layer with cylindrical protrusions to induce macrobending in an optical fiber.
  • Experimental testing using two types of optical fibers, two impactor materials, and two impactor designs.
  • Varying protrusion bend radii from 3 mm to 10 mm and applying weight loads up to 10 kg.
  • Measuring optical loss in decibels (dB) as a function of applied weight in kilograms (kg).

Main Results:

  • A linear relationship between optical loss (dB) and applied weight (kg) was observed for loads exceeding 2 kg.
  • The sensor demonstrated a tunable response, with optical loss ranging from 0.5 dB to 25 dB for a 10 kg load.
  • The proportionality constant, indicating sensor sensitivity, could be adjusted by modifying physical parameters like bend radius and material choices.

Conclusions:

  • The developed optical fiber macrobending loss sensor offers a flexible and tunable solution for weight measurement.
  • The sensor's linear response and adjustable sensitivity make it suitable for applications requiring accurate weight detection.
  • Further optimization of sensor components and design can enhance performance for specific weight sensing requirements.